Antarctica posting again. Schizoposters and normieposters welcome.
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@BowsacNoodle Same way they knew the circumference of the Earth, they had some pretty smart dudes
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@Wolffkran @BowsacNoodle much more than pretty smart. Geometry is actually sick as shit because it basically underlies a huge portion of math and it starts with "ok you have a ruler and a compass .. " and the whole point is just making mathematical proofs, but physically, not abstractly.